Are there nonstop flights from Seoul (ICN) to Porto (OPO)?

No. The fastest connection is via Copenhagen, about 12h 56m of total flying time.

What is the fastest connection from Seoul (ICN) to Porto (OPO)?

via Copenhagen ≈ 12h 56m, via Amsterdam ≈ 12h 57m, via Paris ≈ 12h 57m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Incheon International Airport (ICN) to Francisco de Sá Carneiro Airport (OPO)・10,147 km

No nonstop flights. The fastest connection is via Copenhagen (CPH), about 12h 56m of flying time (layover not included).

With milesANA 30,000 miles+ (via FRA)JAL 45,000 miles+ (via CDG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

23 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.